BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, AUGUST 10 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM FRONTAL PASSAGE EARLY TODAY
FIRST MEASURABLE RAINFALL OF AUGUST
 
The overnight low temperature of 65F occurred last
evening and temperatures were on the rise since
about mid-evening as a warm front approached and
arrived early today. A light to briefly moderate
rain shower occurred before dawn and left behind
just 0.03 inch, our first measurable rainfall this
month.
The last four days were cool ones and this month
has now slipped slightly below normal in its
average temperature. 
 
Today's observations:
 
7 A.M.  
Weather: Obscurement with heavy fog
Temperature: 70F, Dew point: 70F, Wind: SSW at 8 kts
Sea-level pressure: 29.88 inches Hg, rising
Visibility: 1/16 miles; zero past hour
6-hour minimum temp: 67F
BHO SA 1155 W1 X 1/16F 120/70/70/2008/988/
VSBY INCRSNG/ZERO PST HR/ 8//// 55007 ASOS
60003 MANUAL 6003/ ASOS 70003 MANUAL 70003 10070 20067
 
10 A.M.
Weather: Thin broken cirrus, few stratocumulus
Temperature: 79F, Dew point: 69F, Wind: SW at 9 kts
Sea-level pressure: 29.89 inches Hg, falling
Visibility: 15 miles, 20 miles WNW, hazy
BHO SA 1455 220 SCT 250 –BKN 15 121/79/69/2309/989/
FEW SC VSBY WNW 20 HAZY ALQDS/ 8/501 50001
 
WEATHER SUMMARY FOR SUNDAY, AUGUST 9
 
TEMPERATURE (DEGREES F)
MAX.....76    NORMAL.....80
MIN.....59    NORMAL.....62
MEAN....68    NORMAL.....71
 
DEPARTURE FROM 30-YEAR AVERAGE..........-3
TOTAL DEPARTURE FOR THE MONTH...........-2  [-0.4 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............25 SSE AT  5:16 P.M. 
                   AEROVANE..............23 SSE AT  5:16 P.M. *
                   ASOS..................24 SSE AT  5:16 P.M.   
                   DAVIS.................23 SSE AT  5:16 P.M.
FASTEST MILE FOR YESTERDAY...............17 SSE AT  5:21 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............18 SSE AT  2:14 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........17 SSE AT  2:14 P.M. 
AVERAGE WIND SPEED AND DIRECTION.......11.3 SSE
                   ASOS................11.2
                   DAVIS...............10.5 S [175 DEG]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.03   DEPARTURE....-0.10
                         ASOS..............0.03
TOTAL PRECIPITATION FOR THE MONTH..........0.03   DEPARTURE....-1.11
                         ASOS..............0.03
TOTAL PRECIPITATION FOR THE YEAR..........31.29   DEPARTURE....+0.74
                         ASOS.............32.41
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
8/1  83/63/73/+1/0/823/95    18 SSE
8/2  77/64/71/-1/T/104/12    25 SSE
8/3  84/67/76/+4/0/638/74    17 SW
8/4  83/66/75/+3/0/714/83    23 S
8/5  86/67/77/+5/T/378/44    27 SSW
8/6  76/61/69/-3/0/564/66    18 SSE
8/7  79/58/69/-2/0/.../..    32 W
8/8  74/55/65/-6/0/.../..    21 WNW
8/9  76/59/68/-3/T/.../..    25 SSE
  
8/10 our morning low temp: 67F; the normal low is now 62F 
 
NEW DAILY RECORDS FOR AUGUST 2009 TO DATE...
NONE
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR AUGUST 10
HIGH 101F IN 1949 [STATION RECORD MAXIMUM - Tied with 8/2/1975]
LOW 49F IN 1964
PRE 2.27 INS IN 1952
PEAK GUST 88e MPH S IN 1976
 
RECORDS FOR AUGUST 11
HIGH 97F IN 1944
LOW 49F IN 1972
PRECIP 3.13 INCHES IN 1990
PEAK GUST 44 MPH SW IN 1971
 
TODAY'S REPORT PREPARED BY: Robert Skilling